Native Biome: Warm Amazon floodplain waters; specialist aquarium setups.
Discus
Symphysodon aequifasciatus
Named for the disc-like round body of these Amazonian cichlids.
Linnaean Taxonomic Tree
Tens to 100+ g
Female: SimilarGraceful
Burst Acceleration5–10 years
Captivity: 10+ yearsCompare Look-Alikes
vs Freshwater Angelfish
🐣Growth & Lifespan
Birth to old age slider
🔍 Distinctive Diagnostic Markings & Anatomy
Critical morphological field marks naturalists use to verify species identification in the wild.
Round body with vertical bars; many captive color strains.
Small mouth for a cichlid.
Prominent.
Pointed dorsal/anal fins forming the disc silhouette.
Rounded to lyre.
Difficult
🍖 Trophic Role & Hunting Strategy
OmnivorePicks aufwuchs and small prey.
🏕️ Social Behavior & Activity Rhythms
DiurnalPairs when breeding; sensitive to water quality
Intense biparental care
Life Cycle, Growth & Lifespan Journey
| Age | Stage | Length/Height | Weight |
|---|---|---|---|
| Birth / Hatch / Day 0 | Young | 4–6 cm | 0.00002–0.00004 g |
| Early growth | Young | 5–7.4 cm | 18–30 g |
| Mid juvenile | Juvenile | 6.8–10.2 cm | 52.5–87.5 g |
| Late juvenile | Juvenile | 8.8–13.2 cm | 90–150 g |
| Near maturity | Adult | 10.8–16.2 cm | 128–213 g |
How Big Will a Discus Get?
Calculate estimated adult weight, shoulder height, remaining growth timeline, and weekly development rate based on current age and biometrics.
Conservation Status & Population Dynamics
Wild + captive
Subject to ongoing wildlife telemetry monitoring
- •Collection pressure historically
- •Water quality needs in captivity
- Habitat protection
- Public education
Field Intelligence & Diagnostic Hub for Discus
Rounded to lyre.
Audio frequency analysis, territorial roar/call synthesis, and harmonic resonance measurements.
Ecosystem food web, trophic interactions, and cohabiting species in Amazon / Aquarium.
⚖️ Look-Alike Species Differentiation Matrix
Instant one-click comparison tools to prevent common field misidentifications
Discus vs. Freshwater Angelfish
Key DifferentiationAngelfish are tall/triangular; discus are nearly round.
Discus tank size & care
- Minimum tank
- 300 L (79 US gal)
- Adult size
- 15 cm (5.9 in)
- Temperature
- 28–31 °C (82–88 °F)
- pH
- 5–7
- Group
- At least 5
- Temperament
- Peaceful
- Care level
- Expert
Needs very warm, clean water and frequent large water changes.
Typical husbandry values from Seriously Fish, FishBase and OATA. Captive-bred fish often tolerate a wider range.
Discus Tank Calculators
Discus are usually kept warmer than most community fish and are sensitive to water quality, so many keepers rely on frequent, large water changes. A heater sized for the full temperature rise matters, especially in a cool room.
Plan big water changes safely with the aquarium water change calculator, which allows for nitrate in your tap water.
Figures:Merck Veterinary Manual: Management of aquarium fish
Water Change Calculator
How much water to change, and the percentage that brings nitrate down to your target.
Open calculator
Heater Calculator
Heater wattage from tank size, room temperature and the temperature your fish need.
Open calculator
Aquarium Size Calculator
Tank volume in litres and gallons, and the real water volume after substrate and decor.
Open calculatorHow to Identify Discus from a Photograph
Standard operating procedures for photographers and field naturalists submitting sightings for verification.
- 📷Clear side profile
- 📷Head/face close-up
- 📷Full body in natural light
- 🔍Round disc body
- 🔍Vertical bars
- 🔍Pointed unpaired fins
- ⚠️Confusing with freshwater angelfish
Frequently Asked Questions About Discus
Verified answers compiled by zoologists, wildlife biologists, and field guides.
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